update to latest bstore, which now properly handles modifications during Query.ForEach

vendor/github.com/mjl-/bstore/store.go

@@ -75,9 +75,18 @@ type Tx struct {
 
 	bucketCache map[bucketKey]*bolt.Bucket
 
+	// We need to keep track of queries to set reseek on their execs when updating
+	// (put/delete) the record/index bucket for their cursors.
+	queries []bucketReseeker
+
 	stats Stats
 }
 
+type bucketReseeker interface {
+	// bucketReseek is called on queries when a bucket changed (put/delete).
+	bucketReseek(b *bolt.Bucket)
+}
+
 // bucketKey represents a subbucket for a type.
 type bucketKey struct {
 	typeName string